 Hello and welcome to the session. I am Deepika here. Let's discuss a question which says if A and B are any two events such that probability of A plus probability of B minus probability of A and B is equal to probability of A then probability of B upon A is equal to 1 probability of A upon B is equal to 1 probability of B upon A is equal to 0 probability of A upon B is equal to 0. So let's start the solution. Now we are given probability of A plus probability of B minus probability of A and B is equal to probability of A since probability of A plus probability of B minus probability of A and B is equal to probability of A this implies probability of A plus probability of B minus probability of A intersection B is equal to probability of A again this implies probability of A plus probability of B minus probability of A intersection B minus probability of A is equal to 0. So this implies probability of A intersection B is equal to probability of B. So this implies probability of A intersection B upon probability of B is equal to 1. So this implies probability of A upon B is equal to 1. Now this is our option B. So B is the correct answer. I hope the solution is clear to you. Bye and have a nice day.